condition mean min max ZT0-3 1.5533875 1.213905 1.89287 ZT4-7 18.7679 18.7679 18.7679 ZT8-11 16.90895 16.90895 16.90895 ZT12-15 0 0 0 ZT16-19 5.248005 5.248005 5.248005 ZT20-23 5.731154999999999 5.731154999999999 5.731154999999999